Switch for alternating-current machines.



F. W. TREPRY. SWITCH FOR ALTERNATING CURRENT MACHINES.

APPLICATION FILED NOV.25, 1911. 1,038,990.

Patented Sept. 17, 1912v 3 SHEETSSHEBT 1.

WITNESSES i 44/6/5917 BY P. W. TREFRY. SWITCH FOR ALTERNAIING CURRENTMACHINES.

APPLICATION FILED NOV. 25. 1911. I

Patented Sept. 17, 1912.

3 SHEET8SHEET 2. 1

' INVENTOR R M 77 51614;

BY D ATTORNEYS I wxmsssss F. W. TRBFRY. SWITCH FOR ALTERNATING CURRENTMACHINES.

APPLICATION FILED NOV. 25. 1911. 1,038,990.

8 SHEETS-SHBET 3.

ATTORNEYS Patented Sept. 17', 1912.

so .the' purposes for which tacked m.

Elf-CK VIILLIAM TREFEY, 03E PENNSYLVAN SWITGH FOE ALTEBNATING-GUREEHTMACHINES.

fipecification of Letters Patent.

Itatented it, 1912.

Application filed Nove1nber'25, Serial No. 862,322.

To all whom may concern Be it known that l, Fnnbiuoir VVILLIAM Tanner, acitizen of the United States of America, residing at Pittsburgh, in thecounty of Allegheny and State of Pennsylvania, have invented certain newand useful Improvements in Switches for Alternating- Currentlv/lachines, of which the following is a specification, reference beinghad therein to the accompanying drawing.

This invention relates to a switch for an alternating currentniachindespecially that type used in elevator service, and my inventionaims to provide :First, a switch em.- bodying positive and reliablemeans, in a manner as will be hereinafter set forth, whereby a positivethrow of the switch will be obtained, thereby preventing the burning outof motors. .Second, a switch that can be used in connection wi halternating current machines of the two phase threewire, three phase, ortwo phase four. wire type. Third, a positive-throw mechanism that can beused in connection with various types of rotary switches and contactsforobtaining a quick make and break of a current. Fourth, a switchconsisting of comparatively few parts, inexpensive to manufacture, easyto assemble, durable and highly eilicient for it is intended. l fith theabove and other objects in View, the invention resides in the novelconstruction, combination and arrangement of parts to be hereinafterspecifically described and then claimed.

Reference will now be had to the drawings, wherein like numerals denotecorre sponding parts throughout the several views, in which Figure l isa side elevation of a switch in accordance with this invention, showingthe hood or cover thereof removed, Fig. 2 is a longitudinal sectionalview of the switch, Fig. 3 is an end view-of the switch, Fig. i is across sectional view of the same taken on the line IV-IV of Fig. 1, Fig.5 is a similar view taken on the line V-V of Fig. 1, Fig. '6 is a viewof the end plate of the switch with the mechanism thereof removed, Fig.7 is a plan of the switch with the hood orscover thereof removed, Fig. 8is an elevation of a detached sector gear, 9 is an elevation ofadetached drum head, and Fig.

10 is an elevation of a vde in accordance with this invention comprisesa base plate 1 rectangular in plan and having one end thereof providedwith an intcgralwall 2 that has the upper edge thereof rounded, as at 3and the inner side of said wall cut away or provided with a shoulder toaccommodate one end of a detachable coveror hood The opposite end of theplate 1 has a transverse vertical flange 6 and bolted or otherwiseconnected to said flange, as at 7 is an end wall 8 corresponding inshape to the wall 2, said wall ng a shoulder 9 to acconuno date theopposite end of the cover or hood 5.

The end walls 2 and S are provided with longitudinally alining openings10 for the ends of a rotor or shaft 13., one end of said rotorprotruding from the end wall 2. Loosely mounted upon the rotorlL'between the end walls 2 and 8, are the heads 12 and 13 of anon-conductive drum or cylinder 14c, preferably made of fiber. The drumis secured to the heads by circumferentially arranged screws 15 or otherfastening means. Embedded in the periphery of the drum 14: are contactpieces 16, i7 1 and 18 adapted to be engaged by sets of. contact fingers19, 20, 21, 22 and 23 carried by a block 24: arranged upon the baseplate The sets of contact fingers 12 to 23 inclusive are made of aresilientconductive material and the sets 19 and 20 are connected uponthe block 2 1- by cross bars 25. The contact fingers are connected towires leading to and from the motor, to wire for cutting the phase andreversing and to the operating lines.

Encircling the rotor 11 within theklruin 14 is a coiled spring 2d havingone end thereof suitably connected, as at 27 to the inner side of thedrum head 13. The opposite end of the spring is connected to a bolt orpin 28 mounted in the rotor 11 approxi mately intermediate the endsthereof. The outer side of the drum head 13 is a circular enlargement 29provided with shoulders 30 and 31, the object of which will presentlyappear. V

The outer side of the end wall 2, adjacent to the upper edge thereof, isprovided with. a longitudinally apertured boss 32 and journaled in saidboss is crock shaft 33. This rock shaft is adapted to be rocked by arock head, operated by a cable, engine or any other suitable mechanism,especially the starting and stopping mechanism of an ele: vator. Forthis reason I have not illustratcd the mechanism employed for rocktheshaft, for as applicable to various uses. llilounted upon the shaft is asector gear 34: and the inner side of this gear has an enlargement 35provided with teeth 36. The sector gear is adapted to mesh with asegment gear wheel I 87 mounted upon the protruding end ol the rotor 11.The segment gear 37 forms the end of a hub 38 that has a tooth adaptedto be engaged by the teeth 36and the inner end of the hub has a cam 40.

Pivotally connected to the inner side of "the end wall 2 by pins areoppositely d' posed arms 42 and 43 having the upper ends thereofapertured, as at at and connected by retractile springs 45 to the endWall 2. The lower ends of the arms and a l adapted to engage theshoulders 30 and 31 respectively of the c rcular enlargement 29 of thedrum head. 13, The sides of the arms 42 and 4-3, at the lower endsthereof, are provided with spindles iii l, through oblong openings 47provided therefor in the end wall 2. The outer ends of the spindles 46are provided with revoluble rollers 48 retained normally in en agement-With the cam 4-0, as best shown in Fig. 3 of the drawings.

Pivotally connected to the inner side of v the end wall 2 by a pin 49 isa lever 50 having the lone" arm thereof connected to the J o I o a wall2 by a coiled retractile spring 5i. The short arm ofthe lever 50 hasspindle extending through an opening 53 provided therefor in tliGWilll2. The outer end of the spindle 52 has a revoluhle roller 5 nor mallyengaging the cam 40. The short arm of the lever 50 also has a tooth 55adapted to alternately engage the shoulders 30 and.

'31 of the enlar 'ement 29 of the drum Uperationr In order that theoperation of the switch can be fully understood, it nece y to hear inmind that the coiled. spring 28 encircling the rotor ll is normallyinactive, that is, it is not under tension except when the switch isoperated. I will now assume that the s at s- 33 is rocked. The movementof the shaft is free until one of the teeth 36 engages the tooth 39 andthen the teeth of the sector gear 34 mesh with the teeth or" thesegmentgcar 37. The spring 26 assumes tension as the segment gear 37'revolves, until lever 43 is re leased. The tension of the spring 2-8quickly restores the drum head in that the shoulder 30 e i of the lever50. 's position is not under i The short arm of the lever 50 is notreleased until tl' cam has been suitieiently moi" and immediately uponthe 5 being rocked in. the opposite to r moves the segnently the carethere under tension in oel'ore stated, the switch the opposite andallowing the spring to quickly restore protruding connection with"incense direction, releasing the arm 50 the parts to a centralposition. A rocking movement of the shaft 33 direction act-uates thecontact drum in the same manner, only in an opposite direction, and itis through. the medium of the spring 26 that a quick make and breakcontact is accomplished between the contact pieces of the drum and thecontact lingers, thereby preventing the motor from being burned out,

From the foregoing it will be observed that the sector gear 34- and thesegment gear 37 constitute means for revolving the rotor 11 and placingthe spring 26 under tension, while the arm 9 and 43, together with thele r 50, constuute means for holding the drum 1.4, in an adjustedpcsitionuntil released. The ITOlu-atitdrum describes an oscillatorymovement and the spring inclosed by said drum is of sutlicient strengthto proin the opposite drum when released.

It is thought that the operation and. utility of the switch will. beapparent without further description, and while in'the drawings there isillustrated a preferred embodiment of the invention, it is to heunderstood that the structural elements there oi. are susceptible tosuch variations as fall within the scope of the appended claims.

What I claim is 1. .ln a switch for alternating current machines forelevator service, the combine; tion with a rock shaft, or" a rotor means0})- erated by said rock shaft and capable of operatively engaging withsaid rotor for oscillating it, a contact drum loosely mounted upon saidrotor and having a yieldable said rotor, means for holding said drumduring a movement of said rotor in one direction, and means adapted l0T616386 tilt) l'lFSl mentioned ll'ltillS whererotor, and sets of contactfingers associated with said drum.

Qflln a switch for alternating current machines, an oscillatory rotor, acontact drum loosely mounted upon said rotor and yieldably i'ng saiddrum during a movement of said rotor, and means for releasing said drumwhereby said drum will oscillate while said rotor is stationary.

3. In a switch for alternating current machines, a rotor, a contact drumloosely mounted upon said rotor, a spring encircling said rotor withinsaid drum and having one end thereof fixed to said rotor and theopposite end to said drum, means in con nection with said rotor forplacing said spring under tension, means for automatically holding saiddrum during the operation of said rotor, and means adapted to connectedthereto, means for holdrelease the last mentioned means whereby saidspring can restore said drum to its normal position.

t. In a switch for alternating current machines for elevator service,the combination with a rock shaft, of a rotor, a contact drum looselymounted u on said rotor, a

spring connecting said rotor and said drum, means actuated by said rockshaft and operatively engaging with said rotor for placing said springunder tension, means for holding said drum wliile said spring is placedunder tension, and means operated by said rotor for automaticallyreleasing the last mentioned. means.

in a switch tor alternating current machines tor elevator service, arotor, a contact drum loosely mounted upon said rotor, sets of contactlingers associated with said drum,

a spring having the ends thereof attached to said rotor and to saiddrum, means including gears for placing said spring under tension, meansincluding arms for holding said drum while said spring is placed undertension, means including a lever for locking said drum in an adjustedposition, and. means carried by said rotor for releasing said arms andlever.

6. in a switch for alternating current machines tor elevator service,the combination with contact lingers and a contact drum adapted to makeand break circuits through said lingers, of a spring located within saiddrum, a rotor including sector gears for placing said spring undertension, means including arms tor holding said drum while said spring isplaced under tension, means for automatically locking said drum in anadjusted position, and means carried by said for releasing said arms andlooking means.

i. in a s itch tor alternating current machines ter elevator servicecomprising the combination with sets of contact fingers, oppositelydisposed bars for connecting a ringer to one of a finger of anothersetand an oscillatory contactdrum for making and breaking"circuitsthrough said fingers of a spring located within said drum, a rotorincluding sector gears for placing said spring llll'i. er tension, meanscapable of engaging with said gears for operating them, a pair 01'elements engaged with said drum for holding the same stationary whilesaid spring is placed under tension, means for automatically lockingsaid drum in an adis placed under tension,

justalole position and means carried by the rotor for releasing saidarms and said lock mg means.

8. In a switch of alternating current machines for elevator service thecombination of contact fingers, and an oscillatory contact drum formaking and breaking circuits through said fingers of a spring locatedwithin said drum and capable of oscillating the latter, a rotorincluding sect-or gears for placing said spring under tension, springcontrolled pivoted arms adapted to engage said drum for holding it whilesaid sging said arms provided with rollers, a spring controlled. leveradapted to engage said drum for locking it in an adjusted position, aroller carried by said lever and a cam carried by said rotor,

and adapted to engage said rollers .to release the arms and lever.

9. In a switch for alternating current means for elevator, a rotor andan oscillating contact drum loosely mounted. upon said rotor, meanstor'yieldably connecting said. drum to said rotor, said meansconstituting a medium tor oscillating said drum, contact lingersassociated with said drum, means for holding said drum during a movementof said rotor, means carried by the rotor for releasing said holdingmeans whereby said drum will be oscillated by its operative means whilesaid rotor is stationary, and means -tor operating said rotor.

10. In a switch for alternating current means for elevator, a rotor, anoscillatingcontact drum loosely mounted upon said rotor, means foryieldably connecting said drum to said rotor, said means constituting amedium for oscillating said lingers associated with said drum, means forholding said drum during a movement of said rotor, means carried by therotor for releasing said holding means whereby said drum will beoscillated by its operative means while said rotor is stationary, andmeans for operating said rotor, and means for locking said-drum in itsadjustable posi tion, said locking means capable of being released bythe means carried by the, rotor for releasing said holding means.

In testimony whereof I affix my signature in the presence of twowitnesses.

FREDRICK WILLIAM TREE-RY.

Viitnesses KARL- H. BUTLER, MAX H. SRoLovrrz.

each, by addressing the Commissioner of Patents,

drum, contact

